Love being the 1st to find these 🙂
The main issue is with the new code version 1.3(1g) binding vCenter to an EPG brings up the expected screen but there is now a 2nd required field (Primary VLAN) that was not required previously.
Work around options for now:
1. create the association as dynamic.
2. include junk info, then modify it.
3. Use the REST API.
Bug ID CSCuz47137